Improvement in window-cleaning step-chairs



A. DORMITZER Window-Cleaning Step-Chair.

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:y INVBNTQIE/ #i 7) ATTORNEYS.

NPEI'EIS, PHDTO-LITHOGRAFMER, WASMNGTDVN. D C.

UNITED STATES ANNA DORMITZER, 0F NEW YORK, N. Y.

IMPROVEMENT IN WINDOW-CLEANING STEP-CHAIRS.

Specification forming part of Letters Patent No. 206,935, dated August13, 1878; application filed May 27, 1878.

To all whom it may concern:

Be it known that I, ANNA DORMITZER, of New York city, in the county andState of N ew York, have invented a new and Improved Window-CleaningStep-Chair, of which the following is a specification:

Figure 1 is a front elevation of my improved window-cleaning step-chair.Fig. 2 is a vertical section taken on line ac m in Fig. 1. Fig. 3 is aplan view. Fig. tis ahorizontal section taken on line y y, lookingupward. Fig. 5 is a side elevation, showing the chair folded.

Similar letters of reference indicate corresponding parts.

The invention will rst be described in connection with the drawing, andthen pointed out in the claims.

Referring to the drawings, A is a platform of suitable size to stand orsit upon, having at its front edge a narrow board or cleat, B, which isjoined to it at right angles and projects downward, and having at itsrear edge a similar cleat or board, G, which projects upward at rightangles. Two cleats, D, are attached to the under surface of the platformA, one at each side edge. In these cleats there are several holes, a,for receiving arod, b, which supports'the brace E.

Chains F are attached to the brace E and pass through a block, G,attached to the bottom of the platform, and are received by hooks on thetraveling nut c, that is placed on the screw d, which is journaled inthe block G and in the cleat B, and is provided with a winged head, e,by which it may be turned. The rod b, upon which is placed the brace E,may be inserted in any of the holes a to acconmodate the device to wallsof different thickness.

The platform A is provided with two levelin g-screws, f, which bear uponthe windowsill, and render the platform level and secure. To the underside of the platform A, near the cleat B, is hinged a support, H, which,when unfolded, presses against thecleat B. The window-sill and the wallbelow the windowsill are clamped between the brace and the support H.

A step, I, is secured to the lower part of the support H by means ofbrackets g, and an auxiliary step, h, is connected with the support H bycurved straps t', which are pivoted to the edges of the support, andalso to the ends of the step.

The auxiliary step h is provided with folding legs j, and it may beraised above the platform A and supported by the said legs and by thecurved straps fi, which are secured in slots in the end of the platform,and are secured by pooks k, that are pivoted to the top of the platorm.

The support H is provided with two springs, l, one at each side, whichare operated by eccentrics m, so as to bring them to a bearing on theinner surface of the wall.

The platform A has near each of its side edges an aperture for receivingthe screw of the standards n, which are designed to be grasped by thehand to steady the person using the window-cleaning chair. To the upperside of the platform, near the outer or back edge and inside of thecleat O, the back or guard J is hinged.

From the edges of the back two pins,o, project to engage thedetent-springs p, that are secured to the platform and hold the back ina vertical position. The detent-springs consist of a wire that is curvedand formed into a loop, which receives the pin when the back is raised.

The auxiliary step is designed to afford a means of reaching the upperportion of the window.

When the device is not in use it may be compactly folded together, sothat it requires little room for storage.

I am aware that it is not new to make a safety window step-chair with afolding back, brace, and front support, or to use horizontally andvertically adjustable supports or standards in connection with theplatform 5 but 1. The combination of the auxiliary step h, straps i, andlegs j with the support H and platform A, as herein shown and described.

- 2. The combination of the springs l and eccent-ries m with the supportH, as herein shown and described.

ANNA DORMITZER. Witnesses M. A. WATSON, GEO. M. HOPKINS.

